Ternary Ionic Compounds
polyatomic ions- ions made up of two or more
atoms that carry a charge
*found on sheet
ex- sulfate SO4 2hydroxide OH 1nitrite NO2 1-
-most polyatomic ions are anions
-only positive on sheet is:
ammonium NH41+
Ternary Ionic Compounds
-compounds that contain ions of usually three
different elements with a polyatomic ion
Rules for naming ternary ionic compounds
1) write the formula (symbol and charge) for
each ion
ex- calcium + nitrate
Ca2+ NO312) criss cross charges
Ca1NO32
3) you may need parentheses around polyatomic
ion if a subscript greater than 1 goes there
Ca1(NO3)2
4) lowest whole number ratios
Ca(NO3)2
5) name cation then polyatomic anion
calcium nitrate
Examples:
1) potassium + sulfate
K1+ SO42-
K2SO4
potassium sulfate
2) tin (IV) + sulfite
Sn4+ SO32Sn2(SO3)4
Sn(SO3)2
tin (IV) sulfite